Forum discussion
CS-2009 SSc7.2: Heat Island Effect—Roof
Hello,
We are trying to achieve this credit for one of our projects. The roof will have a white coating except for the parapet which will have a metallic aluminum cladding.
We thought initially this would not be a problem, but it turns out that the parapet will occupy a large proportion of the roof area.
As such my question is: Should the roof parapet be considered in the roof area calculations for the purpose of this credit ?
Many thanks !
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We don't know the SRI value of some roofing materials we are using. What should we do?
Do balconies and terraces need to be counted towards the roof square footage?
How does one calculate the square footage of a pitched roof?
Mara Baum
Partner, Architecture & SustainabilityDIALOG
674 thumbs up
April 13, 2010 - 8:03 pm
As per the Reference Guide, appurtenances are exempt from this calculation, along with mechanical equipment and PV panels. I typically think of parapets as appurtenances, because by definition they are a less significant element associated with the roof. It sounds like that might not be the case for your parapet, however, which leaves this as more of a judgment call.
Janika McFeely
Associate, Sustainability SpecialistEHDD Architecture
110 thumbs up
June 14, 2010 - 7:54 pm
Do you generally include walking pads on roofs or lump that into the excluded category as well? Thanks
Mara Baum
Partner, Architecture & SustainabilityDIALOG
674 thumbs up
June 14, 2010 - 10:09 pm
It's my understanding that walking pads are included. There are several walking pad products that meet the SRI requirements, although you can also require a conventional pad with an added coating. This can be pretty important, as walking pads can potentially make up a significant percentage of roof area.
James Weiner
PrincipalCollaborative Project Consulting
52 thumbs up
September 23, 2010 - 4:34 pm
The horizontal surface of the parapet can contribute to heat island. This surface is not an appurtenance (which would include things like ladders, pipes, antennae, etc.). Intent of the credit should be considered here so you don't get bogged down in meaningless analysis of course.
Usually (big roof and typical parapet), the area of the top of a parapet would not change the outcome of the calculation for this credit, but you would want to look at it if significant. Imagine an 18-24" wide dark painted metal coping around a 2500 sf roof - around 10% of the roof area net of equipment. Might matter...and such buildings have been built. As well - parapet area can exceed walking pad area.